Star Trek - Alien Nations Friends or Foes

Aliens who appeared in either The Original Series, Next Generation, Deep Space Nine or Voyager were friends, enemies or both. See if you can answer these questions on the many Alien Nations encountered by Star Fleet.

Is Star Trek: Deep Space Nine your favorite Star Trek series? It is definitely mine. Darker and more socially relevant than the others; this series enlightened us as no other Star Trek series had done before.